After the last population report the PIO population went to 0 for AJ-293a. I had settled on the planet last week and had the initial 200 PIO but it looks like they all left. It looks like there is one other person on the planet but am not sure if they are active or not.
Thanks for the bug report, I fixed the population!
If someone leaves a planet, are 200 PIO taken away?
If someone demolishes a base their initial 200 PIOs are removed.
What if those initial PIOs have already migrated/got educated? Might adversely affect other players.
That is true, we don’t incorporate that yet. The rationale for removing the initial 200 pioneers was to prevent already crowded planets from a PIO flood when a lot of new players join, and then leave again.